单项选择题

We managed to reach the top of the mountain, and half an hour later we began to ______ .

A．ascend
B．descend
C．decline
D．plunge
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单项选择题
When trapped in drifting sands, do not struggle, or you will be ______ in deeper.
A．absorbed
B．pushed
C．heaved
D．sucked
单项选择题
The policy ______ made, the next problem was how to carry it out.
A．having been
B．being
C．had been
D．was
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